title: Validity of body adiposity index in predicting body fat in a sample of Brazilian women.
abstract: OBJECTIVE
  This study aimed to verify the validity of BAI in predicting %BF in a sample of Brazilian women
  
  
  METHODS
  A total of 102 women (average age 60.3 ± 9.8) were assessed. To determine percentage body fat (% BF), dual-energy X-ray absorptiometry (DXA) was used as the "gold standard." To evaluate the association between body adiposity index (BAI) and % BF assessed by DXA, we used Pearson's correlation coefficient. Paired sample t-test was used to test differences in mean % BF between BAI and DXA. To evaluate the concordance between % BF measured by DXA and estimated by BAI, we used the Lin's concordance correlation coefficient and the agreement analysis of Bland-Altman.
  
  
  RESULTS
  The correlation between % BF obtained by DXA and that estimated by BAI was r = 0.65, P < 0.001. Paired t-test showed significant mean difference between methods (P < 0.0001). Lin's concordance correlation coefficient was C_b = 0.73, which is classified as poor, while the Bland-Altman plots showed BAI underestimating % BF in relation to the used criterion measure in a large portion of the sample.
  
  
  CONCLUSIONS
  Results of the present study show that BAI presented low agreement with % BF measured by DXA, which is not recommended for % BF prediction in this studied sample.
authors.affiliation: Department of Physical Education, Federal University of Viçosa, Minas Gerais, Brazil; Federal Institute for Education, Sciences and Technology, Rio Pomba, Minas Gerais, Brazil.
authors.forename: Matheus
authors.initials: M
authors.lastname: Cerqueira
authors.forename: Paulo
authors.initials: P
authors.lastname: Amorim
authors.forename: Filipe
authors.initials: F
authors.lastname: Magalhães
authors.forename: Eliane
authors.initials: E
authors.lastname: Castro
authors.forename: Frederico
authors.initials: F
authors.lastname: Franco
authors.forename: Sylvia
authors.initials: S
authors.lastname: Franceschini
authors.forename: Lizbeth
authors.initials: L
authors.lastname: Cerqueira
authors.forename: João
authors.initials: J
authors.lastname: Marins
authors.forename: Leonice
authors.initials: L
authors.lastname: Doimo
mesh_terms: D015502:Absorptiometry, Photon; D000273:Adipose Tissue; D050154:Adiposity; D000368:Aged; D000886:Anthropometry; D001823:Body Composition; D001938:Brazil; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008875:Middle Aged; D015203:Reproducibility of Results
keywords: body adiposity index; body fat; women